Spark-plug.



c. L. BUNDY.

v SPARK PLUG. APPLICATlON FILED APR.!6,1915- 13125149. PatentedJan.16,1917.

CYRUS L. BUNDY, OF EAST ORANGE,

NEW JERSEY, A BOHLEBER, OF NEW' 30.1? 1*.

SPARK-PLUG.

Application filed April 16,

To all w/wm [15 may concern:

lle it known that l. (lYinis' L. Bunny, a eitizen ot' the United States,residing at East Orange, in the eountv of Essex and State of New ltl'. thave invented certain new and useful Improvements in k-lparle Plugs, of\vhieh the following a full, clear, and exact desel'iption.

The invention which eonstitutes the subject matter ol this a iiplieationrelates to a spark plug which is provided with means whereby the eore(an be quiekl} removed "from the surrounding bushing for eleaning theeleetrmles. and tor-other purposes, without neressarilv unserewing thebushing from the engine. V

In the drawings: Figure 1 is a side view f a full-sized plug showing thebayonet slot (-onneetion; Fig. dis a ventral longitudinal section of theplug; Fig. 3 is a section taken on line 3-3 of Fig. 1; Fig. l is aseetion on line 4-4 of Fig. 2.

Referring to the drawing in detail the reference numeral 10 designates abushing of a spark plug provided with the usual serewthreaded lower end,and also provided with a bayonet slot 11. The character 12 designatesthe core, made ol porcelain or other suitable material, and providedwith suitable electrodes 13 and ll. At an intermediate portion the eoreis provided with a shoulder 15 which rests upon a e0rresponding shoulder1(3 of the bushing 10. The core is provided with a sleeve 17 which islixed against longitudinal movement means of the shoulder 15 and a ring16 o" spring metal snapped into an annular groove eneireling said core.The sleeve 17 however is fitted to l-i'eely rotate about the eore.Preferably serewthreaded to the sleeve 17 is another sleeve 19 providedwith laterally extending lugs 20 \vhieh are adapted to enter the bayonetslots 11 and when suitably turned are adapted to pass below and engageunder the ears 2i ol the bushing the size and loeation of said earsbeing preterably as illustrated. The upper end of the sleeve 17 isprovided with a handle or other equivalent means for assembling andseparating the core from the bushing.

The operation of the deviee is as l-ollows: Alter the sleeve 17 has beenproperly posi tioned about the (tore and the sleeve 15) fitted thereon,as illustrated in Fig. 2. the lower end of the said sleeve 17 is sh0ulSpecification of Letters Patent.

1 of the bayonet slot.

Ifatentotl 2 2.110 193. 1915.

lion, hasa limited vertical movement the on-liinited in the lowerdirection bv the flange 23 and limited in its upward inovement by thehandle 22. At will a be seen that the eore 12 is adapted both electrodesand also the slee' 19. As a result tl seetions viz.. the latter of whiehmeans. In. assembling caused to enter the ba 'on given a turn to the r Llugs 20 to pass under the sleeve 19 being new reventei movement relativeto the continued rotation of :leev the lower end of the same shoulder 15and foree the same snn the shoulder 18 of the bushing. I

When it is desired to remove reverse n'iovenient is imparted to the her22. The parts should be so de that a slight continued movement sleevewill cause a 1 t ere '1 this the shoulder or enlarged serev read 23 toengage with the sleeve 19 and positively 3:} cause the latter to rotateand has h the lugs "20 from under the ears 21. is pret'erabl a jamei'igagement betwer threads on the respeetive sleeves so when the partsare "gain assembled he will be a suli ieient t' 'etional engagementeaase the lugs 20 to pass under the e and poperlv engage in the rear Itis obvious that various changes in points of detail and otherinoditieatioi be resorted to without neeessarily do g from the truespirit and seope of I11 invention. l therefore do not limit 121$ to thespeeiiie eonstruetimi shown and described.

What I elaim is:

1. In a sparh plig, a bushing provided with a bayonet slot in the upperportion thereof, a role; and means for seeuring the g eeore within thebushing comprising relatively movable sleeves surrouiu said eore andserewibreaded to eaeh other. one of whieh is provided with lugs: adaptedto engage the bushing within the bayonet slot andthe other of whichengages with the corefor eil'ecting a movement of the same relative tothe bushing.

Y bushing.

2., In a spark plug, a bushing provided with a bayonet s 0t in the upperportion thereof, a core, and means fixed to said core for securing thelatter to thebushing comprising relatively movable sleeves one of whichis provided with lugs adapted to engage the bayonet slot and the otherof which is provided With a handle by which it is movable longitudinallywith respect thereto.

3. In a spark plug, a bushing provided with a bayonet slot in the upperportion thereof, a core, and means fixed to said core for securing thelatter to the bushing, comprising sleeves, the first of which isrotatable about but fixed against longitudinal movement on the core, andthe second of which is screwthreaded to the first and provided with lugsadapted to engage the bayonet slot, and means on the first sleeve forrotating both of the sleeves to secure the core to and remove the samefrom the 4. In a spark plug, a bushing provided with a bayonetslotadjacent the upper end thereof and a shoulder at an intermediate inmateportion, a removable core for said bushing provided With a shoulderadapted to rest upon the shoulder of the bushing, and means carried bysaid core adapted to secure the same to the bushing comprising a memberadapted to engage the bayonet slot and a rotatable member normallyresting upon the shoulder of the core and cooperating with the aforesaidmember to force the core downwardly into fluid tight engagement with theshoulder of the bushing.

5. In a spark plug, a bushing provided with a bayonet slot adjacent theupper end thereof and an annular shoulder at an intermediate point, aremovable core for said bushing provided with a shoulder normallyresting upon the shoulder of the bushing, and means carried by said corefor securing the same to said bushing comprising a member engaging saidslots and. a second member engaging the first named member and movablelongitudinally with respect thereto.

In testimony whereof I al'iix my signature in the presence of twosubscribing witnesses;

CYRUS L. BUNDY. Witnesses:

THOMAS J. BYRNE, WILLIAM P. Jomwsorr.

